钛与铌微合金化Q345C钢显微组织与力学性能的对比
Comparison of Microstructure and Mechanical Properties of Ti-Microalloyed and Nb-Microalloyed Q345C Steels
摘 要
对比研究了钛和铌微合金化Q345C钢的显微组织及力学性能.结果表明:两种试验钢均具有较高的屈服强度、良好的延伸性和低温冲击韧性,钛微合金化钢的延展性和低温冲击韧性更好,强度略低;两种钢的组织均由铁素体和珠光体组成,晶粒度均为9~11级;钛微合金化钢中的夹杂物主要为MnS和少量Ti4C2S2,析出物是尺寸为50~250 nm的TiN,强化机制主要为细晶强化;铌微合金化钢中的夹杂物主要为MnS,析出物是尺寸为20~100 nm的Nb(C,N),强化机制主要为细晶强化和沉淀强化.
钛
铌
微合金化
显微组织
力学性能
Q345C steel
Ti
Nb
microalloying
microstructure
mechanical property
Abstract
The microstructure and mechanical properties of Ti-microalloyed and Nb-microalloyed Q345C steels were studied contrastively.The results show that the two kinds of steels both had high strength,good extensibility and excellent low-temperature impact toughness.Ti-microalloyed Q345C steel had better extensibility and low-temperature impact toughness,but it had lower strength.The microstrure of the Ti-microalloyed steel was similar to that of the Nb-microalloyed steel,both of them were composed of ferrite and pearlite and the grain sizes were 9-11 grade.For the Ti-microalloyed steel,the main inclusions were MnS and a few Ti4C2S2,the precipitation was TiN with sizes of 50-250 nm,and its strengthening mechanism was fine grain strengthening.For the Nb-microalloyed steel,the main inclusion was MnS,the precipitation was Nb(C,N) with sizes of 20-100 nm,and its strengthening mechanism was fine grain strengthening and precipitation strengthening.
中图分类号 TG142.1 DOI 10.11973/jxgccl201507003
所属栏目 试验研究
基金项目
收稿日期 2014/1/6
修改稿日期 2014/12/14
网络出版日期
作者单位点击查看
备注周家林(1966-),男,湖北安陆人,副教授,硕士.
引用该论文: ZHOU Jia-lin,XIANG Shang,HUANG Gao,PAN Cheng-gang,HU Tang-guo. Comparison of Microstructure and Mechanical Properties of Ti-Microalloyed and Nb-Microalloyed Q345C Steels[J]. Materials for mechancial engineering, 2015, 39(7): 17～21
周家林,向上,黄高,潘成刚,胡唐国. 钛与铌微合金化Q345C钢显微组织与力学性能的对比[J]. 机械工程材料, 2015, 39(7): 17～21
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【5】衣海龙,杜林秀,王国栋,等.含钛高强度钢变形奥氏体的连续冷却相变[J].机械工程材料,2006,30(12):4-10.
【6】HAN Y,SHI J,XU L,et al.Effect of hot rolling temperature on grain size and precipitation hardening in a Ti-microalloyed low-carbon martensitic steel[J].Materials Science and Engineering:A,2012,553:192-199.
【7】YI Hai-long,LIU Zhen-yu,WANG Guo-dong,et al.Development of Ti-microallloyed 600MPa hot rolled high strength steel[J].Journal of Iron and Steel Research (International),2010,17(12):54-58.
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